Viessmann Vitodens 200-W Series Installation And Service Instructions Manual page 85

Fault codes
(cont.)
Displayed Const.
fault code
Fd X
Fd X
FE X
FF X
Faults without fault display
Fault
Burner blocked and 3
displayed in code 38.
Weath.- System characteris-
comp. tics
X Burner in a fault state
and additional fault
b7 is displayed
X Burner in a fault state Fault, burner con-
X Burner blocked or in
a fault state
X Burner blocked or in
a fault state
Cause
Flow rate insufficient.
Circulation pump or flow switch faulty,
or heat exchanger blocked.
Cause Measures
Boiler coding card Insert the boiler coding
is missing card.
Press reset button R.
Replace control unit if
fault persists.
Check ignition electrodes
trol unit and connecting cables.
Check whether a strong
interference (EMC) field
exists near the appliance.
Press reset button R.
Replace control unit if
fault persists.
Boiler coding card Press reset button R. If
or main PCB faulty, the fault persists, check
or incorrect boiler the boiler coding card and
coding card replace boiler coding card
or control unit if necessa-
ry.
Internal fault or re- Start the appliance again.
set button R Replace the control unit if
blocked the appliance will not re-
start.
Action
Check circulation pump and flow switch, re-
placing them if necessary.
Flush and clean heat exchanger.
Troubleshooting
85